Adsorption characteristics of tetracycline by two soils: assessing role of soil organic matter

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	Adsorption characteristics of tetracycline by two soils: assessing role of soil organic matter
	Bao, YY ; Zhou, QX ; Wang, YY
刊名	AUSTRALIAN JOURNAL OF SOIL RESEARCH
	2009
卷号	47 期号:3 页码:286-295
关键词	tetracycline antibiotics soil organic matter adsorption soil pollution
ISSN号	0004-9573
通讯作者	Zhou, QX, Nankai Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Pollut Proc & Environm Criteria, Tianjin 300071, Peoples R China
中文摘要	The adsorption characteristics of tetracycline by 2 soils including a clay-rich soil (cinnamon soil) and an iron oxide-rich soil (red soil) were investigated as a function of soil organic matter (SOM). SOM is the main adsorbent for tetracycline in the soil environment. The results indicated that the adsorption kinetics of tetracycline by the different soils with or without organic matter was described by the Elovich equation and the exponent equation. The adsorption of tetracycline on red soil was quite rapid and equilibrium could be reached after 5 h. In contrast, the concentration of tetracycline in cinnamon soil reached equilibrium after 11 h. The difference in equilibrium time in cinnamon soil and red soil was caused by their dominant components for adsorption, including clays, organic matter, and Al/Fe hydrous oxides. It took longer for the penetration of tetracycline into the interlayers between clays and organic matter in cinnamon soil, but tetracycline needed less time for adsorption through surface complexation on oxide surfaces of red soil. Removing SOM from soil markedly shortened the equilibrium time (7 h) of adsorption and reduced the equilibrium concentration (Cs) in cinnamon soil, but not in red soil, because of different dominant components for adsorption in the 2 natural soils. In natural and SOM-free soils, >98% of tetracycline in solution could be sorbed. The adsorption of tetracycline on natural and SOM-free soils was well described by Freundlich adsorption isotherms. Batch adsorption experiments showed that the adsorption of tetracycline on natural red soil was stronger than that on natural cinnamon soil. Adsorption capacity (K-F) decreased with an increase in SOM removed from soil, which is attributed to the effect of tetracycline sorbed by SOM in different soils. However, SOM affected the adsorption intensity (n) of different soils diversely; there was a decrease for red soil and an increase for cinnamon soil. In particular, red soil with high Al/Fe hydrous oxides had higher adsorption affinities than cinnamon soil.
学科主题	Soil Science
收录类别	SCI
资助信息	International Foundation for Science (Sweden) [AC/19097]; Ministry of Education, People's Republic of China [707011]; National Natural Science Foundation of China [20777040]
语种	英语
WOS记录号	WOS:000266305100005
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54153]
专题	沈阳应用生态研究所_沈阳应用生态研究所_期刊论文
推荐引用方式 GB/T 7714	Bao, YY,Zhou, QX,Wang, YY. Adsorption characteristics of tetracycline by two soils: assessing role of soil organic matter[J]. AUSTRALIAN JOURNAL OF SOIL RESEARCH,2009,47(3):286-295.
APA	Bao, YY,Zhou, QX,&Wang, YY.(2009).Adsorption characteristics of tetracycline by two soils: assessing role of soil organic matter.AUSTRALIAN JOURNAL OF SOIL RESEARCH,47(3),286-295.
MLA	Bao, YY,et al."Adsorption characteristics of tetracycline by two soils: assessing role of soil organic matter".AUSTRALIAN JOURNAL OF SOIL RESEARCH 47.3(2009):286-295.